Gömböc

Wikipedia says:
"A gömböc or gomboc (Hungarian: [ˈɡømbøts]) is a convex three-dimensional homogeneous body which, when resting on a flat surface, has just one stable and one unstable point of equilibrium. Its existence was conjectured by Russian mathematician Vladimir Arnold in 1995 and proven in 2006 by Hungarian scientists Gábor Domokos and Péter Várkonyi."

This is a rescaled Gömböc from seanmichaelragan. It has been separated into 2 parts for easier printing and possibility to add material Inside. Dimensions are 90 mm x 100 mm for each shell.
Print two shells and bond them together to get a Gömböc! The idea is to fill the shells with Synthetic plaster. It is not very expensive, and liquid enough to fill the half shells. It is very fast to dry, so be quick! It is not easy to sand but liquid enought to fill accuratly all the inside of the shells and very heavy. Bond the shells together at the end. On the picture, I also sanded the outer perimeters a little bit and added a produc